Piston-pump.



J. M. BENSON. PISTON PUMP.

APPLICATION FILED 00T. e, 1909.

2 SHEETS-SHEET 1.

Patented Ju1y19,1919.

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Jf M. BENSON.

PISTON PUMP.

APPLICATION FILED OUT. 6, 1909.

- Patented Ju1y19, 1910.

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UNITED STATES IATENT OFFICE.

JOHN MERTON DENSO; OF CORTLAND, NEW YORK.

PISTON-PUMP.

To all 'whom it may concern:

Be it known that I, JOHN Mnn'roN DEN- soN, of Cortland, in the county of Cortland, in the State of New York, have invented new and useful Improvements in Piston- Iumps, of which the following, taken in connection with the accompanying drawings, is .a full, clear, and exact description.

This invention relates to certain improvements in double acting piston pumps, involving the use of specific forms of oscillatory valves operating intermittingly at the end of each stroke of the piston, through the medium of connections with the driving mechanism for controlling the inlet and outlet of the water or other fluid, to and from opposite ends of the cylinder.

The main object is to increase the utility, durability and range of use of this class of pumps and at the same time to reduce to a minimum the friction of the fluent through the pump and particularly through the valves. In other words, I have sought to produce a combined suction and force pump.

capable of pumping liquid, air or gases or for dredging purposes and at the same time reducing the liability of rendering the pump inoperative by excessive frictional wear or clogging the valves.

Other objects and uses relating to specific parts of the pump will be brought outv in the following description:

In the drawings: Figures l and 2 are respectively a top plan and a side elevation of a pump, involving the various features of my invention, the cylinder and right hand valve in Fig. 2 being shown in section. Fig. 3 is a horizontal sectional view taken on line 3 3 Fig. 2. Figs. 4l and 5 are vertical sectional views taken respectively on lines .1 -fl and 5 5, Fig. l.

In carrying out the objects stated, I provide a cylinder 1 with a movable piston Q and opposite tubular end heads 3 and 3 which latter are deflected in the same direction at substantially right angles to the cylinder' and are suitably secured to the central portions of transversely extending valve casings 4- and These valve casings and valves therein, presently described, are of the same construction and therefore the same description applies to both valve mechanisms. Each valve casing 4 is provided in one side with a central port 5- which communicates with the adjacent end of the cylinder 2 The oppo- Specication of Letters Patent.

Application filed October 6, 1909.

Patented July 19, 1910.

Serial No. 521,292.

site side of this valve casing is provided with an inlet port Q and an outlet port 6 said ports being located nearV the ends and equi-distant from the center of the valve casing. The ports 6- at one end of the valve casings are connected by a suction pipe 7 having a central branch 8- adapt ed to be connected to the source of liquid supply. The outlet ports G at the opposite end of the valve casings are connected together by a pipe 7 having a central outlet pipe l0 In some instances I may prefer to use an air chamber l1 connected to the outlet pipe 7 in which air may be compressed by the outflowing liquid, `during the compression stroke of the piston, so as to maintain a more continuous flow of the liquid through the outlet.

Suitable oscillatory valves 19- are fitted within their respective casings 4 and 4; Each valve is provided with axially projecting studs 13 and 13 which are journaled in suitable bearings 1liin the casing heads, as 15 and is formed with straight parallel passages 16- and 1 6- extending diagonally and diametrically therethrough, said passages being separated by a partition 17 The distance from center to center of the ends of the passages, parallel with the axis, is substantially equal to half the distance from center to center of the ports 6 and 6 and is also equal to the amount of offset of one end of each passage from the opposite end so that when the valve is shifted to one of its positions, one end of one of the diagonal passages is registered with the port 5 while the opposite end of the same passage is registered with one of the diagonally opposite ports and when the valve is shifted to the other 'extreme position the other diagonal passage connects the port 5 with the other diagonal opposite port. In other words the inner ends of the passages 1G and l6 are diametrically opposite to each other and in the same transverse plane as the port 5 while the outer ends of said passages nearest the end of the valve are disposed in the same transverse planes, respectively, as the ports 6 and (3-, thereby causing the inner ends of the passages 16 and 16 to alternately register with the port 5 and their outer ends to alternately register with the ports 6 and 6 as the valve is rotated a half turn from one position to the other.

Any suitable means may be employed for reciprocating the piston, such means consisting, in this instance, of a driving shaft l8 carrying a pulley 19 and pinions Q0 which mesh With suitable gears 2l the latter being eccentrically connected by a connecting rod 22 to a cross head 23 to which the outer end of the piston rod, as 24 is secured. The pulley 19 may be connected by a belt to any available source of power not shown for transmitting rotary motion to the gears or eccentrics 2l and thence through the medium of the connecting rod 22 to the piston 2 The valve 12 is oscillated intermittingly, one half turn at a time, as the piston approaches the end of its stroke and, although any means may be employed for accomplishing' this result, I have shown one of the gears 2l as provided With an eccentric roller-stud QG- which alternately engages inclining abutments 27 and 28 on a sliding rod 29 These abutments are disposed at opposite sides of the axis of gears 21 in parallel planes, facing each other, and are spaced apart a distance corresponding substantially to the throw of the eccentric stud 26 so that as the piston approaches the limit of its stroke, in one direction, the roller-stud 26 Will coact with one abutment 2S- to move the bar 29 in the same direction and thereby draw the other abutment into the path of movement of the roller-stud to be engaged thereby as the piston moves to the limit of its stroke in the opposite direction and thus return the bar 29 to its starting position. This reciprocal action of the bar 29 is utilized to simultaneously oscillate the valves l2 in the same direction by a suitable mechanism as follows: One of the supporting studs, as l3 of each valve extends some distance through and beyond the adjacent end head 15 of the valve casing lt and is provided With a pinion 30- which meshes with a sliding tooth raclr 31 said rack being provided with an additional tooth section 32 meshing with a pinion 33 on a shaft 3Lle the latter carrying an additional pinion 35 which meshes with a similar tooth raclr 36- on the sliding bar 29 lt is noiv apparent that the movement of the valves is synchronized With that of the piston, the parts of the valve operating mechanism being arranged and adjusted so that When the piston approaches the limit of its stroke, toward one end of the cylinder, the valve at that end of the cylinder Will be operated to connect the suction port Q with the adjacent port 5 While the valve at the opposite end of the cylinder Will be shifted to connect the outlet port G with the corresponding port 5--. Assuming, for example, that the piston Q is near the right hand end of the cylinder, as shown in Fig. 2, and is being moved back toward the opposite end of the cylinder and that the right hand valve l2 has just been shifted so that the passage 1G of the right hand valve connects the ports 5 and 6 while the passage l6 of the left hand valve connects the adjacent ports 5 and 6 thus it is clearly apparent, that, as the piston is moved to the left, the liquid Will be drawn through the pipes 8 and 7 port 6 passage 16- and port 5 of the right hand end valve into the corresponding end of the cylinder 2 Then the liquid in advance or at the left of the piston Will be simultaneously forced from the cylinder through the corresponding port 5 and thence through the valve passage l6 and port 6 into the outlet pipe 7 whence it may be conducted to any desired locality. A portion of the Water which is forced through the outlet Will be forced into the air chamber 11 thereby trapping and compressing the air therein, Which opcrates to additionally expel the Water therefrom, as soon as the pressure upon the Water by the piston is relieved, thus maintaining a more uniform floW of Water through the outlet.

That I claim is:

l. In a piston pump, a valve mechanism comprising a tubular valve casing having a single port in one side and a pair of ports in the opposite side located equi-distant from and at opposite sides of the transverse plane of the single port, and a cylindrical valve having parallel diagonally extending passages therethrough, the inner end of said passages being located in the same transverse plane as the single port and their outer ends disposed in the same transverse planes as the corresponding opposite ports, and means for oscillating said valve one half revolution at a time.

2. In a pump apparatus, a valve casing having an inlet port and an outlet port in one side and an additional port in its diametrically opposite side and an oscillatory valve in the casing having separate parallel passages extending diagonally therethrough and having their inner ends disposed in the same transverse plane coincident With that of the additional port and their outer ends disposed in the same transverse planes as the inlet and outlet ports respectively, and means for oscillating said valve.

3. In a double acting piston pump, a cylinder, a piston movable in the cylinder, means for actuating the piston, valve casings at opposite ends of the cylinder, each of said valve casings having an inlet port and an outlet port in one side and an additional port in its opposite side, the additional port communicating With the adjacent end of the cylinder, a pipe connecting the inlet ports of both valve casings, a separate pipe conand means for simultaneously oscillating said valves.

4. In a pump, a valve mechanism including a valve having passages extending transversely therethrough and terminating at one end in diametrically opposite sides of the valve in the same transverse plane.

5. In combination with a cylinder, a piston movable in the cylinder, valve casings, one for each end of the cylinder, each valve casing having an inlet port and an outlet port in one side and an additional port in its diametrcally opposite side, the additional port being connected to the adjacent end of the cylinder, oscillatory valves having reduced ends journaled in the ends of their respective casings, each valve being provided with transverse passages therethrough terminating at one end in diametrically opposite sides of the valve and in the same transverse plane as the additional port, and their opposite ends terminating in the same transverse plane as the inlet and outlet ports, respectively, means for reciprocating the piston, and additional means for oscillating both valves intermittingly but simultaneously one-half revolution at a time.

In Witness whereof I have hereunto set my hand this twenty ninth day of September 1909.

JOHN MERTON DENSON. Witnesses:

HIRAM BANKS, WM. J. MANTANYE. 

